Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.755.05-5.22
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
None
Mohs Hardness
4.5-55.5-6
2
10
👆🏻
Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)